<template>
  <div id="app">
    <div class="container">
      <!-- 顶部搜索框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="val in list" :key="val.id">
            <td>{{ val.id }}</td>
            <td>{{ val.name }}</td>
            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{ red: val.price > 100 }">{{ val.price }}</td>
            <!-- | 意思就是把左边的值传给右边并过滤 -->
            <td>{{ val.time | resolve }}</td>
            <td><a href="#" @click="delBtn(val.id)">删除</a></td>
          </tr>
          <tr style="background-color: #eee" v-if="!(list.length == 0)">
            <td>统计:</td>
            <td colspan="2">总价钱为: {{ allPrice }}</td>
            <td colspan="2">平均价: {{ svgPrice }}</td>
          </tr>
        </tbody>
        <tfoot>
          <tr v-if="list.length == 0">
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model="name"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="价格"
              v-model.number="price"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="addBtn">
          添加资产
        </button>
      </form>
      <div>{{ msg | toUp }}</div>
    </div>
  </div>
</template>

<script>
import "bootstrap/dist/css/bootstrap.css"; // 默认找文件夹下的index文件(但是这个不是所以需要写路径)
// // 导入moment
import moment from "moment";
export default {
  data() {
    return {
      name: "", // 名称
      price: "", // 价格
      msg: "hello,word",
      list: JSON.parse(localStorage.getItem("a")) || [
        { id: 100, name: "外套", price: 199, time: new Date("2010-08-12") },
        { id: 101, name: "裤子", price: 34, time: new Date("2013-09-01") },
        { id: 102, name: "鞋", price: 25.4, time: new Date("2018-11-22") },
        { id: 103, name: "头发", price: 19900, time: new Date("2020-12-12") },
      ],
    };
  },
  // 定义局部过滤器
  filters: {
    resolve: (val) => moment(val).format("YYYY-MM-DD"),
  },
  methods: {
    addBtn() {
      this.list.push({
        // 获取list数组最后一个id然后+1作为新添加的id
        id: this.list[this.list.length - 1].id + 1,
        name: this.name,
        price: this.price,
        time: new Date(),
      });
      // 添加后清空输入框
      this.name = "";
      this.price = "";
    },
    // delBtn(index) {
    //   this.list.splice(index,1)
    // }
    delBtn(id) {
      console.log(id);
      // 使用筛选把传入的id去除并赋值给数组
      this.list = this.list.filter((item) => item.id !== id);
    },
  },
  computed: {
    allPrice() {
      // 遍历计算总价
      return this.list.reduce((sum, item) => (sum += item.price), 0);
    },
    svgPrice() {
      // 计算均价并保留两位小数
      return (this.allPrice / this.list.length).toFixed(2);
    },
  },
  // 侦听数组
  watch: {
    // 因为这里是数组需要写完整
    list: {
      handler(newVal) {
        console.log(newVal);
        localStorage.setItem("a", JSON.stringify(this.list));
      },
    },
  },
};
</script>

<style scoped>
.red {
  color: red;
}
</style>